Allows only numbers to be entered into a text box.

Public Class NumericTextBox
    Inherits System.Windows.Forms.TextBox

    Private _Long As Long
#Region " Windows Form Designer generated code "

    Public Sub New()
        MyBase.New()

        'This call is required by the Windows Form Designer.
        InitializeComponent()

        'Add any initialization after the InitializeComponent() call

    End Sub

    'Form overrides dispose to clean up the component list.
    Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
        If disposing Then
            If Not (components Is Nothing) Then
                components.Dispose()
            End If
        End If
        MyBase.Dispose(disposing)
    End Sub

    'Required by the Windows Form Designer
    Private components As System.ComponentModel.IContainer

    'NOTE: The following procedure is required by the Windows Form Designer
    'It can be modified using the Windows Form Designer.
    'Do not modify it using the code editor.
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        components = New System.ComponentModel.Container()
    End Sub

#End Region

    Protected Overrides Sub OnKeyPress(ByVal e As System.Windows.Forms.KeyPressEventArgs)
        If Char.IsControl(e.KeyChar) = False And Char.IsDigit(e.KeyChar) = False Then
            e.Handled = True
        End If
    End Sub

    Private Sub NumericTextBox_TextChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles MyBase.TextChanged
        Try
            _Long = Text
            Text = _Long
        Catch ex As InvalidCastException
            If Text = "" Then
                _Long = 0
            Else
                Text = _Long.ToString
            End If
        End Try
    End Sub
End Class

Craig

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